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I use a 30mm OD stainless steel M5 flat washer in between the collimation screws and the back of the secondary holder. The main screw attaching the secondary to the spider is M5 so it's a perfect fit. The collimation screws press against this instead of the secondary holder.
To make the secondary holder easier to rotate, I use another washer cut from a plastic milk jug in between the washer and the secondary holder.
And finally, to reduce scarring on the stainless steel washer, I use another plastic milk jug washer between it and the collimation screws.
This is all just slipped on over the secondary attachment bolt after the spring goes on. No need to glue anything. By not gluing you can always rotate the washers if they get too marred by the screws in one spot.
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